I am new at RESTful webservices and was trying to update my @OneToMany relationship from a standalone client application, but I am not able to do that. I am using the Jersey implementation of JAX-RS that ships with Glassfish 3.1.1.
I have a class A that has a @OneToMany relationship with class B.
MyRestClient is my standalone client that is calling my RESTful webservice which has been deployed on Glassfish 3.1.1.
MyRestClient.java
public class MyRestClient {
public static void main(String[] args) {
Client client = Client.create();
WebResource resource = client.resource("http://localhost:8080/myapp/rest/a/update/123");
B b1 = new B("debris");
ClientResponse response = resource.put(ClientResponse.class, b1);
System.out.println(response.getEntity(A.class).getTitle() + " has " + response.getEntity(A.class).getBList().size() + " Bs.");
}
}
AResource is an EJB session bean which I am using as RESTful webservice.
AResource.java
@Stateless
@Path("/a")
public class AResource {
@EJB
private AManager aManager;
@PUT
@Consumes(MediaType.APPLICATION_XML)
@Produces(MediaType.APPLICATION_XML)
@Path("/update/{id}")
public Response updateA(B b, @PathParam("id") int id) {
A a = aManager.findAById(id);
a.addB(b);
return Response.status(Status.OK).entity(a).build();
}
}
When I run the client I get the following error message: com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type, class myPackage.B, and MIME media type, application/octet-stream, was not found.
Following are the domain objects in my standalone client application which is making a call to the AResource EJB session bean which I am using as the RESTful webservice.
A.java
@XmlRootElement
public class A implements Serializable{
private List<B> bList = new ArrayList<B>();
public List<B> getBList() {
return bList;
}
//remaining code
}
B.java
public class B implements Serializable {
private String text;
private A a;
@XmlTransient
public A getA() {
return a;
}
public void afterUnmarshal(Unmarshaller u, Object parent) {
this.a = (A) parent;
}
//remaining code
}
Could someone help me understand why this is happening and how I should solve this problem?
This question is related to
web-services
rest
jersey
java-ee-6
jax-rs
i was facing the same problem for a get method i was returning an "int" for the @get method Strangely when i change the return type to String the error was gone.Give it a try and if someone knows the logic behind it kindly share it
You need to specify the @Provider that @Produces(MediaType.APPLICATION_XML) from B.class
An add the package of your MessageBodyWriter<B.class> to your /WEB_INF/web.xml as:
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>
your.providers.package
</param-value>
</init-param>
This can also happen if you've recently upgraded Ant. I was using Ant 1.8.4 on a project, and upgraded Ant to 1.9.4, and started to get this error when building a fat jar using Ant.
The solution for me was to downgrade back to Ant 1.8.4 for the command line and Eclipse using the process detailed here
This solved my issue.
Including following dependencies in your POM.xml and run Maven -> Update also fixed my issue.
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.19.1</version>
</dependency>
<dependency>
<groupId>com.owlike</groupId>
<artifactId>genson</artifactId>
<version>0.99</version>
</dependency>
Include this dependencies in your POM.xml and run Maven -> Update
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.18.1</version>
</dependency>
<dependency>
<groupId>com.owlike</groupId>
<artifactId>genson</artifactId>
<version>0.99</version>
</dependency>
Adding reference to:
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>${jersey1.version}</version>
</dependency>
As long as adding clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, true); on client creation solved the issue for me:
ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, true);
Client client = Client.create(clientConfig);
Make sure that all these libs are in your class path:
compile(group: 'com.sun.jersey', name: 'jersey-core', version: '1.19.4')
compile(group: 'com.sun.jersey', name: 'jersey-server', version: '1.19.4')
compile(group: 'com.sun.jersey', name: 'jersey-servlet', version: '1.19.4')
compile(group: 'com.sun.jersey', name: 'jersey-json', version: '1.19.4')
compile(group: 'com.sun.jersey', name: 'jersey-client', version: '1.19.4')
compile(group: 'javax.ws.rs', name: 'jsr311-api', version: '1.1.1')
compile(group: 'org.codehaus.jackson', name: 'jackson-core-asl', version: '1.9.2')
compile(group: 'org.codehaus.jackson', name: 'jackson-mapper-asl', version: '1.9.2')
compile(group: 'org.codehaus.jackson', name: 'jackson-core-asl', version: '1.9.2')
compile(group: 'org.codehaus.jackson', name: 'jackson-jaxrs', version: '1.9.2')
compile(group: 'org.codehaus.jackson', name: 'jackson-xc', version: '1.9.2')
Add "Pojo Mapping" and "Jackson Provider" to the jersey client config:
ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
clientConfig.getClasses().add(JacksonJsonProvider.class);
This solve to me!
ClientResponse response = null;
response = webResource
.type(MediaType.APPLICATION_JSON)
.accept(MediaType.APPLICATION_JSON)
.get(ClientResponse.class);
if (response.getStatus() == Response.Status.OK.getStatusCode()) {
MyClass myclass = response.getEntity(MyClass.class);
System.out.println(myclass);
}
This also happens if you're missing an empty public constructor for the Entity (could be for JSON, XML etc)..
You have to do two things to remove this error.
@xmlElement mapping in the modelThe client side:
response = resource.type(MediaType.APPLICATION_XML).put(ClientResponse.class, b1); //consume
or
response = resource.accept(MediaType.APPLICATION_XML).put(ClientResponse.class, b1); //produce
Source: Stackoverflow.com